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b-13+4b=7b+1
We move all terms to the left:
b-13+4b-(7b+1)=0
We add all the numbers together, and all the variables
5b-(7b+1)-13=0
We get rid of parentheses
5b-7b-1-13=0
We add all the numbers together, and all the variables
-2b-14=0
We move all terms containing b to the left, all other terms to the right
-2b=14
b=14/-2
b=-7
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